Identification and evidence
The MasterTuning ECU-file catalogue lists a Citroën ZX 1.8 8-valve M5.1 example with Bosch hardware number 0 261 200 664. A file-list example is not a complete vehicle fitment list.
Identification and scope
Retain the complete ECU designation, Bosch and vehicle-manufacturer part numbers, engine, vehicle year and market, hardware and software identity. Similar names do not establish shared pin assignments, calibration files or programming procedures. Examples above are source-scoped and are not a complete fitment list.
Source accessed 10 November 2026.